Comparative biosorption of Mn(II) and Pb(II) ions on raw and oxalic acid modified maize husk: kinetic, thermodynamic and isothermal studies
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Date
2013
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Abstract
Maize husk, an abundant agricultural waste
was used to prepare a biosorbent for the biosorption of
Mn(II) and Pb(II) ions from aqueous solution in a batch
process. Equilibrium and kinetics of biosorption of the
metals ions were studied at 25 C. The adsorbtion data
were treated with common kinetic and isotherm models.
The equilibrium data fitted well with Langmuir isotherm
with maximum capacity of 8.52 and 7.38 mg g-1 for
Mn(II) and Pb(II), respectively on raw biomass (UTCS).
The capacity of 9.00 and 9.33 mg g-1 was observed for
Mn(II) and Pb(II), respectively on acid modified biomass
(ATCS). The study also revealed that the sorption process
in both cases depend on biomass dosage, temperature, pH
and initial metal ion concentration, respectively. The calculated thermodynamic parameters (DGo, DHo and DSo)
showed that the biosorption of the metal ions onto maize
husk is feasible, spontaneous and exothermic in nature